Synchronous Touch Display Panel Driving Method
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Solution Overview
Problem
Existing touch display devices have a low report rate due to the need for separate stages of display and touch operations, which limits the improvement in report rate and increases production costs and panel thickness.
Innovation Solution
A touch display panel and driving method that allows synchronous operation of touch detection and display by reusing touch emission electrodes as a common electrode layer, transmitting a superposed signal to pixel electrodes or anodes during display scanning, ensuring no interference with the touch signal and maintaining a high report rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate stages are used for display and touch operations, then the display and touch functions can be implemented, but the report rate is limited and production efficiency is reduced
Solution Approach 1:
The patent merges the display and touch operations into a single synchronous stage by superimposing touch detection signals with display driving signals on the same electrode lines. This allows both functions to be performed simultaneously during the same scanning period, eliminating the need for separate time stages and thereby improving the report rate while reducing operational complexity
Solution Approach 2:
The patent makes the electrode lines serve dual purposes: they function as both display driving lines and touch detection lines. By reusing the same electrode infrastructure for both display and touch functions, the system achieves multi-functionality without requiring additional dedicated lines, thus improving productivity without increasing device complexity
2Ease of manufacture
If touch emission electrodes are reused as common electrode layer, then production cost is reduced and thickness is reduced, but signal interference may occur between touch and display signals
Solution Approach 1:
The patent converts the potential harmful signal interference into a beneficial superimposed signal. By intentionally designing the touch detection signal to be superimposed on the display driving signal during the same time period, the system transforms what could be interference into a functional feature that enables synchronous operation. The touch induction electrode structure further helps distinguish the touch signal from display signal through capacitive coupling principles
Solution Approach 2:
The patent introduces touch induction electrodes as intermediary elements that facilitate touch detection without directly conflicting with display signals. These induction electrodes act as mediators that couple capacitively with the emission electrodes, allowing touch signal transmission while maintaining display functionality. This intermediary structure helps isolate and identify touch-specific signals from the combined signal environment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high report rates and reduced production costs by allowing touch detection during display without affecting the display effect, eliminating the need for separate stages and improving production efficiency.
Implementation Method 1
a storage capacitor, which is formed by the touch emission electrode and the pixel electrode corresponding to the touch emission electrode
Data Source
AI summary
A touch display panel, a driving method and a touch display device are provided. Touch and display are driven synchronously in the touch display panel. That is, touch detection is implemented while the display is performed and there is no need to perform the display and the touch in different stages, thereby avoiding limiting an improvement on a report rate, and ensuring a high report rate of the touch display device.